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Definition of guard rail noun from the Oxford Advanced Learner's Dictionary

guard rail

noun
 
/ˈɡɑːd reɪl/
 
/ˈɡɑːrd reɪl/
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  1. a bar placed on the edge of a path, a boat, etc. to protect people and prevent them falling over the edgeTopics Transport by waterc2
  2. (North American English)
    (British English crash barrier)
    a strong low fence or wall at the side of a road or between the two halves of a major road such as a motorway or interstateTopics Transport by car or lorryc2
See guard rail in the Oxford Advanced American Dictionary

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